Engine-governing device



May 11 YV19226.

H. EDEN BOROUGH ENGINE GOVERNING DEVICE Filed Sept. 30 1925 Patented lill, i923,

istinti;

HAROLD EVDENBOBOUGH, GF CHELSEA, LONBGT, ENGLAND, ASSGNOR TO DOUGLAS WSE DRIVER, OF ASHFORD HLL, NEAR NEVZBERRY, BERKSHRE, ENGLAND.

ENGINE-GOVERNING. DEVICE.

Application filed September This invention relates to engine governors. rilhe type of governor to which the invention relates is that in which the control oiI motive iiuid supplied to the engine is ei- 'iected by means ot a hinged or pivoted reciprocating mass which, when the speed of the engine increases above the normal, coacts with a member, such as a pawl or pivoted rod, whereby the throttle or other governing valve of the engine is controlled through suitable mechanism. ln governors oi this type the mass farried on a reciprocating part oi the engine, such as the crosshead or air-pump lever, or is mounted upon ameniber which is adapted to be reciprocated Yfrom any suitable moving part ot the engine, tor example, from a rotary shai't by means ot an eccentric or the like or from a reciprocating part by means ot a lever, connecting-rod or the like.

rlhe object oi the present invention is to provide an improved governor ot the aforesaid type which is easily accessible i'or purposes ot adjustment and regulation when the engine which it controls is in motion, is easily adaptable to existing engines and is c'iicicnt also in its control olf the .speed oi the engine.

The improved governor, in accordance with the present invention, comprises a baseplate, trame or the like adapted to V be mounted on any suitable fixed structure, a member adapted to be reciprocated from the engine in guides on said trame, a mass 355 pivoted on said reciprocating` member, a slidable member mounted on said base-plate adjacent to the reciprocating` mass and a member which is pivoted on said slidable member and adapted to be positively enf gaged by the mass when the speed ot the engine increases above the normal and moved by it in the direction oi the reciprocating motion and then automatically disengaged and to be again positively engaged by the mass and automatically disengaged when the speed returns to normal.

li desired, means may also be provided whereby when a certain pre-determined speed is exceeded, the device is locked in the position in which theV supply oir' motive fluid is shutl oiif.

According to one preferred torni ot construction of the invention, the reciprocating mass comprises a spring-controlled lever which is pivoted on a sliding member which fill 30, 1925. Serial No. 59,651.

is reciprocated from the engine shaft'. An adjustable weight is mounted upon one end of the lever while the other end is provided with two claws or the like adjacent to the path to which there is mounted a movable bar on which is pivoted a double trip member which is normally just clear of the said claws but, one end of which is engaged by one of the claws on the lever when the speed is increased, -and the other end is engaged by the other claw of the lever when the speed is again reduced to normal, so that the bar is moved upwards or downwards and thereby controls the supply ot motive fluid by any .suitable means.

The control of the supply of motive iiuid to the engine may be effected either directly or indirectly, ttor example, through the piston oi a relay cylinder. ln the latter case the governor may, in accordance also with the invention, operate means such as a fourway cock whereby fluid under pressure may be admitted to either side of the piston in the relay cylinder, the opposite side being at the same time put in communication with the atmos Dhere. In this way, the power available iior controlling the supply of motive iiuid may be increased as desired and will depend upon the pressure of the iuid, for example, compressed air, which is admitted to the relay cylinder and the area oi' the piston.

The governor may be driven either at engine speed or at any other suitable speed by means ot gearing, depending` upon the .speed of the engine. A suitable speed has been found to be about 7 0-10() reciprocations per minute.

y A preferred embodiment or" the invention is illustrated by way ot example in the accompanying drawing, in which Fig. l is a side elevation of the governor, partly in section and connected with a fourway coclr. for operating a relay cylinder which is not illustrated.

it" ig. 2 is a section on the line lI-II of iig. 3, a section on the line Ill-III of i l, and

rigs. 4 and 5 two sections showing the four-way cock in its two alternative positions.

Referring to the drawing, the shoe-plate l is movable inthe guides 2, 2, which are fixed by means of studs e to the base-platel 3, which is mounted on any suitable fixed structure. One of the guides 2 is adjustable, for example, in case of wear, by means of the screws 5. reciprocated in the guides 2, 2 by means of an eccentric or connecting rod 6 which is coupled to a suitable rotating or reciprocating part of the engine, On the shoeplate 1 there is mounted by means oi the pivot 7 an escapement lever 8, one end of which is formed with two claws 9, lraving a projecting stud or distance piece 23 midway between them while the other end is screw-threaded and provided with a counter-balance weight which is adjustable along the screw-thread 43. Below the lever 8 is litted a screw-cap, comprising an outer tubular member 11, which is externally threaded and provided with a head 10 and locking-.nut 12, and an inner tube 9 which is slid-able in the tubular member 11 and fits over a spiral spring 13 enclosed by the said tubes 11 and 9. rlhe screw-cap is held in position below the lever 3 by means of a member 14 which iskiiXed to the shoeplate 1 and provided with an internally threaded aperture into which the member 11 can be screwed and lined in Lany desired position by means of the nut 12. The lever 8 rests with its bottom edge on the end of the tube 9. rEhe screw-cap and the position of the weight on the lever may be so adjusted that the latter will remain in its normal substantially horizontal position, but oscillating to a slight extent about its horizontal axis, tor any predetermined speed of the engine. Adjacent to, but just clear of, the path ol the claws 9, 10 there is arranged a vert-ical bar 15 which is movable up and down in guides 16 and 17 which are fixed to the base-plate 3. The bar 15 is provided at or near its centre with a recess 22 in which is pivoted a latch comprising a substantially vertical portion 13 having toothed or pointed ends 19 and 2O with which the claws 9 and 10 can respectively engage and a substantially horizontal entenion 21 integral therewith which engages, with sufficient play to allow oi" slight oscillation, in the recess 22 in the bar y15. The extension 21 is pivoted, as illustrated in Fig. 2, about a pivot 2l, the head of which lies in a recess in said extension and :is prevented from rotating by means of a pin 25 which engages in a hole in the bar 15. The whole is secured by means of a plate 26, which is fixed by means of studs 27 above the extension 21 in a larger recess in the bar 15. The outer end ot the pivot 24 is provided with a spring 23, adjustable by means of the nut 29, so as to cause side friction when the extension 21 is lmo-ved and retain the latch in any position in which it isplaced or to prevent it from becoming prematurely operative through vibration or The shoe plate 1 can be' wear. rlhe bar 15 is provided with stops 3() and 49 in order to limit its downward and upward movement. A spring-operated push-bolt 50 which engages in a recess 51 in the bar 15, when in its raised position, prevents the bar from prematurely moving downward by its own weight.

rlhe stroke ot the shoe-plate and the distance between the claws 9 and 10 ot the lever and the upper and lower ends 19 and 29 of the latch are so arranged that when the bar 15 is in its normal lower position the stroke of the shoe-plate 1 is such that the lower claw 10 moves from just below the level of the lower end 2O to about the height r oit the upper end 19, and, when the bar 15- is in its upper position, the upper claw 9 moves from just above the level of the upper end 19 to about the level ot the lower end 20.

'lhe mode oi operation is as follows:

The spring-cap 10 and the position of the counter-balance weight 12 are adjusted so as substantially to compensate the inertia et the weight at the predetermined normal speed at which the engine is to run, the lever 8 being slightly tilted upwards so that the top claw 9 bears lightly against, or is just clear of, the bar 15 and the bottom claw 10 is clear ot the latch throughout its stroke at nor nal speed. The spring 23 is also adjusted so that the latch remains in any position in which it is placed owing to friction, and the latch is set so that the top end 19 is level with the face ot the bar 15 or nearly so. A ribbon spring 3l may be provided, as shown in Fig. 1, in order to ensure that the latch remains in the position in which it is set, i. e. with the lower end 2O projecting from the bar.

As long as the speed of the engine remains normal the lever 3 oscillates slightly about .its pivot 7 but not suiiiciently to cause the lower claw 10 to engage the lower end 2O oit the latch. Vilhcn the speed el' the engine increases above the normal the amplitude of the oscillations of the lever 8 increases, owing to the inertia oit the weight overcoming they spring 13, until the bottom claw 10 is brought below the protruding end 2O of the latch and engages in it. The bar 15 is therefore 'drawn upwards and 'thereby operates means ior controlling` the supply of motive iiuid to the engine. Un the next down-stroke et the lever S the distance piece 23 hits the face of the lower half of the latch, whichis still projecting, and thus moves the upper end 19 outwards but this end is again forced back level with the face of the bar 15, and remains in this position owing to the friction at the pivot and te the iact that the spring 31, if iritted, is not able entirely 'to overcome this friction, by the impact of the top claw 9 during thenext up stroke, so that on the next down stroke the claw 9 passes clear et the top end 19 et the latch. This action is repeated so long as the overspeed is maintained, and the bar therefore remains in the raised position and the motive fluid is cut ott or partially cut olif.

As the speed of the engine again returns to normal, the distance piece Q3 on its down stroke again forces the upper end 19 of the latch outwards, in which position it remains since, at normal speeds, the impact et the claw 9 is not suliicient to torce' it back with the tace et the bar 15. Consequently on the next stroke the claw 9 engages in the upper end 19 of the latch and moves the bar 15 downwards and thereby adjusts the means for controlling the supply ot motive vfluid to its original position.

The lgovernor may be adjusted to suit varying` speeds either by screwing` the cap containing` the adjusting spring 13 upwards or downwards according as more or less tension et the spring` is required, or by altering the position o'l the weight 12 on the lever 8 or by a combination et these methods. Should there be any tendency lior the governor to hunt, the spring 28 should be adjusted so as to produce the necessary friction.

The control of the supply ot motive vfluid tothe engine may be effected either directly, or indirectly through a relay, by any suitablel means. rlfhus the bar l5 may be connected to the throttle valve. Or, as illustrated in Figs. 1, d and 5, the bar may operate a switch cock connected with a relay cylinder. In this case the bar 15 is connected by means et the rod S2 with the lever 33 of a tour-way cock 34, of which the outlets 35, 36, 37 and 38 are connected respectively to the gland end et a relay cylinder, to the atmosphere, to a supply ot fluid under pressure, for example, compressed air, and to the back end of the relay cylinder. The connections are such that when the bar 15 is in its lower position, as illustrated in Fig. 1, the pipes 35 and 36 are in connection and also the pipes 37 and 88 so that the full force of the air pressure is applied to the back end of the relay cylinder, the pipe to the other end of this cylinoer being open to the atmosphere. When the bar 15 is moved upwards and turns the lever 33 the pipe to the baclr end ot the cylinder-is opened to the atmosphere providing escape tor the air there, and air pressure is admitted to the gland end of the cylinder through the pipe which was previously open to the atmosphere. The pistonI ot the relay cylinder travels to the other end et the cylinder thereby operating` mechanism to cut eti the supply of motive fluid.

A permanent locking-device whereby the lever S, after having' cut oii' the supply of motive fluid, is locked so that it does not i operate te admit the supply again when the speed returns to normal, may also be pro vided, A suitable device is shown, by way of example, in Figs. 1 and 3, in which 33 is a plate which is pivotcd at one end about a pivot- Ll() which is secured to the member l1, which is iXed to the shoe-plate 1 by means ot bolts l-Q, so that the plate 3S) lies in `iront of the lever 8. The plate 39 is provided with a recess i13 in which a collar-pin del is seated during the normal operation et the governor. A spring ll5 engages the collar on the pin 4A and is housed within a casing 16 which is carried by the member 11. The casingl 4G is made in two parts which are relatively adjustable by means oit screwthreads tor the purpose ot altering the tension of the spring` 45. rlChe lever 8 is pro vided with a recess 117 lying directly behind the recess d3 in which the collar pin may engage. 'lhe pivoted plate 39 is normally held in a substantially horizontal position by the collar pin engaging` in the recess d3.

In operation, the spring is adjusted so that the end of the collar pin fl-.4l presses more or less tightly into the recess t3 in the plate 39, according` to the predetermined speed at which the locking device is required to act. 'When this speed is exceeded the end of the collar pinis thrown out ot engagement with the recess in the plate 3S), owingl to the inertia et the plate, and the plate turns about its pivot a0, thereby allowing the pin to enter the recess l? in the lever S when the latter is in its shut position with the upper claw clear ot the latch and so locking` it in the closed position, in which it remains until re-set by hand..

l claim 1. An engine governor et the inertia type including` a reciprocating member, and a mass pivoted thereon, characterized by a slidable member mounted adjacent said mass, and means pivotally supported on said slidable member for connecting the same to said mass `ter movement thereby when the speed et the engine rises above and returns to normal. j

2. The invention as set 'forth in claim 1. wherein said means comprises a member pivoted on said slidable member and having two portions thereof located adjacent the respective ends ot the path ot mov-ment of said mass, said portions being alternately projected into the path oit movement oft said mass as said member turns about its pivot.

Ythe invention as set iiorth in claim 1, wherein said means connects said mass and said sliding men'iber tor movement in one direction when the engine speed rises above normal, releases said sliding member from said mass at the end or tie motion of the mass in the stated direction, and again connects the sliding member to said mass for movement in the opposite direction when the engine speed returns to normal.

4;. An engine governor o'f the inertia type comprieing a reciprocating n'icmber, a lever pivoted to 'o reciprocating member, a Slidable n'icmbcr mounted adjacent Said lever, and a merel' Yr pivoted to said slidable ineinbcr and ln, ing portions. ther-eet movable into the path of movement et said lever adjacent the respective ends thereo't.

5. An engine governor ot the type set forth comixnising a nwniber adapted to be reciprocated troni the engine, a spring-con trolled lever pivoted on Said reciprocating member and piovitled at one end with weight and at the other end with two claws, a slidable nicnil'ier mounted adjacent to Said Spring-controlled lever and a. latch pivoted on Said slidahle n'ieinber with which one or other ot the said claws can en fre.

6. An .engine governor of the type forth comprising a member adapted Vto be reciprocatcd 'from the en'ni "i, a Spring-con trolled lever pivoted on ld recirn'ocating member and 'provided at one end with an ne yable weight and at the other end with two claws, a slidabl-enien'iber mounted adjacent to Said Spring-controlled lever and a latch pivoted on lSaid elidable member with which one or other oi the l@aid clawe can ei'igage. i

7. An engine governor ot the type eet il'orth comprising a bane-plate adapted to be mounted on a stttionary etriictine, a Sliding n'ieniber which ie reciprocated trom a inoving part ot the engine in guides on the said briefe-plate, a spring-controlled lever pivotcd cn said sliding member eo to be capable ot slight oscillation and provided at one end with a weight and at the other end with two claws, a movable bar adjacent to the path of said claws and a double latch n'ieniber pivoted on Said bar with which the eaid claws fan poeitively engage when the Speed ot' the engine varies.

S. An engine governor ot the type eet forth comprising a base-plate adapted to be mounted on a stationary Structure, a sliding member which is reciprocated Yfrom a moving part of the engine in guides on the said base-plate, a` lever controlled. by an adjustable spii'ing pivotcd on Said Sliding `member so ae to be capable of Slight oscillation and provided at one end with an adjustable weight and at the other end with two claws, a movable bar adjacent to the path ot Said. claws and a double latch member pivoted on Said bar with which the said claws can positively engage when the speed oit the engine varies.

9. A/ln engine governor ot the type eet forth comprising a member adapted to be reciprocated from the engine, a spring-con ig, v 1,584,522

trolled lever pivoted on said reciprocating niember, a slidable member mounted adja-l cent to said Spring-controllod lever and a latch device pivoted on said slidable member one end o? which is movable into position to be positively engaged by the Springcoi'itrolled lever wien the Speed ot the engine increases above the normal while the other end is positively engaged when thc speed .retnrne to normal, and means 'for introdncing friction at the pivot of the trip device.

10. An engine governor of the t pe set forth con'iprising a member adapted to be reciprocated from the engine, a spring-controlled lever pivoted on vsaid, reciprocating member and provided at one end with an :nljnetable weight and at the other end with two claws, a Slidable membermounted adjacent to said spring-controlled lever a latch device pivo'ted on Said Slidable member with which one or other of the Said claws can engage, and means vfor holding one end ot the latch device away. from the tace of the Slidable 'memil'iei".

l1. The invention as set forth in claim 1, in combination with means for locking the governor in ott position when a predetermined speed has been exceeded` i 12. An engine governor ot the type set forth comprising a base-plate adapted to be mounted on a stationary structure, a Sliding member which is reciprocatcd from a. moving part ot the engine in guides on the Said base-plate, a spring-controlled lever pivote/cl on said sliding member and provided at one end with a weight and at the other end with two claws, ay movable bar adjacent to the path ot said claws, a double latch member pivoted on said bar with which the Said clawa can positively engage, and means tor locking the governor in the oft position.

13. rlChe invention as Set forth in claim 1, in combination with a tourney cock and means connecting said Slidable member therewith.

14. An engine governor ot the type set orth comprising` a base-plateadapted to be mounted on a Stationary structure, a. sliding member which is reciprocated from a n'ioving part of the engine in guides on the said base-plate, a spring-controlled lever pivoted on said Sliding member and provided at one end with a weight and at the other end with two claws, a movable bar adjacent to the path ot Said claws, a double latch member pivoted on Said bar with which the said claws can positively engage, a tonr way cock and means connecting Said sli ding member therewith.

HAROLD EDENBGROUGH.

New L.- 

